Arne Slot confirmed Alexander Isak was ruled out of Liverpool ’s trip to Manchester United due to a minor injury in the latest setback to the record signing’s stop-start season. A week after Isak scored his first Premier League goal for Liverpool at Anfield in their win over Crystal Palace , the Sweden international reportedly picked up a groin problem in training before the visit to Old Trafford. Man United v Liverpool LIVE: Latest score and updates as Premier League rivals clash Liverpool have been without the £125m Isak for long spells of the season, following his deadline day arrival from Newcastle United and then when he fractured his leg in December’s win at Tottenham. He returned following the March international break but injuries to Hugo Ekitike and Mohamed Salah compounds his latest absence ahead of Liverpool facing rivals United in the battle for third place.…